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version: "1.0.0" name: building-typology description: >- Identify and apply building typologies for residential, commercial, institutional, hospitality, industrial, cultural, and mixed-use buildings. Use when the user asks about building types, plan configurations, floor plate design, core arrangements, net-to-gross ratios, structural grids, floor-to-floor heights, unit mix, parking strategies, or exemplar buildings. Also use when comparing typological options, selecting an appropriate building form for a site, evaluating plan depth and daylight, or analyzing how a typology affects density, efficiency, and user experience. Covers detached houses through supertall towers, hospitals through hotels, museums through mixed-use podium-tower developments.

Building Typology Skill

You are an expert in building typology with encyclopedic knowledge of plan types, structural systems, dimensional standards, and exemplar buildings across every major use category. You understand how typological choices drive density, efficiency, daylight, construction cost, user experience, and urban form. Every recommendation is grounded in measurable metrics and real-world precedent.

1. Residential Typologies

1.1 Detached House

Metric	Value
Plan Depth	8 - 12m (deeper with central corridors or lightwells)
Storeys	1 - 3 typical
Plot Width	8 - 20m
Typical GIA	80 - 300 m2
Density	10 - 30 DU/ha
NTG Ratio	0.85 - 0.92 (minimal common area)
Structural System	Load-bearing masonry, timber frame, light steel frame
Parking	On-plot garage or driveway, 1-3 spaces
Daylight	All rooms can have windows on 2+ sides; excellent daylight
Private Amenity	Front and rear gardens, 50-200+ m2

Exemplars:

Farnsworth House (Mies van der Rohe, 1951, Plano IL) -- universal open plan, glass pavilion, 140 m2
Maison Bordeaux (OMA/Rem Koolhaas, 1998) -- split-level, hydraulic platform, 500 m2
Moriyama House (SANAA/Ryue Nishizawa, 2005, Tokyo) -- cluster of discrete volumes, 263 m2 total

1.2 Semi-Detached House

Metric	Value
Plan Depth	8 - 10m
Storeys	2 - 3
Plot Width	5 - 8m per unit (pair = 10-16m)
Typical GIA per Unit	70 - 150 m2
Density	25 - 50 DU/ha
Party Wall	Min 100mm cavity masonry, STC 45+
Parking	On-plot driveway, 1-2 spaces per unit
Daylight	Three aspects (front, rear, side); party wall is blank

Exemplars:

Donnybrook Quarter (Peter Barber Architects, 2006, London) -- contemporary semi-detached with courtyard variants, 65 DU/ha
Accordia (Feilden Clegg Bradley / Maccreanor Lavington / Alison Brooks, 2008, Cambridge) -- mixed semi-detached and terrace, 47 DU/ha

1.3 Terrace / Rowhouse

Metric	Value
Plan Depth	8 - 12m
Plan Width	4.5 - 7m per unit
Storeys	2 - 4
Typical GIA per Unit	65 - 140 m2
Density	40 - 80 DU/ha
NTG Ratio	0.85 - 0.90
Structural System	Load-bearing party walls (masonry/concrete block), timber floors
Parking	On-street, rear mews court, or integral garage (reduces habitable area)
Daylight	Two aspects only (front and rear); max depth 12m for adequate rear room daylight
Private Amenity	Rear garden 20-60 m2, front yard 3-10 m2

Key Dimensions:

Min width for 2-bed: 4.5m (internal); 5.0-5.5m preferred
Min width for 3-bed: 5.5m; 6.0-7.0m preferred
Stair width: 850mm min clear, 900mm preferred
Hallway: 900mm min clear

Exemplars:

Georgian Terrace (Bath, London, Edinburgh, 1714-1830) -- 5-7m wide, 12-15m deep, 3-4 storeys, the prototype
Borneo Sporenburg (various architects, 2000, Amsterdam) -- 5.1m wide, 3 storeys, courtyard within plan depth, 100 DU/ha
Goldsmith Street (Mikhail Riches, 2019, Norwich) -- Stirling Prize, Passivhaus terrace, 5.2m wide, south-facing orientation

1.4 Walk-Up Apartment (3-5 Storeys)

Metric	Value
Plan Depth	10 - 14m (single-loaded corridor: 6-8m)
Core Type	Single staircase serving 4-8 units per floor (no lift required below 5 storeys in many codes)
Units per Core	2 - 4 per landing (stair access type); 6-12 per floor (corridor type)
Typical Unit Size	45 - 90 m2 NIA
Density	60 - 150 DU/ha
NTG Ratio	0.78 - 0.84
Structural System	Load-bearing masonry, cross-laminated timber (CLT), reinforced concrete frame
Parking	Surface, undercroft, or basement; 0.5-1.0 spaces/unit
Daylight	Dual-aspect achievable with stair-access type; single-aspect common in corridor type

Core Configurations:

Stair Access (no corridor): Single stair with 2-4 units per landing. Most efficient, best dual-aspect potential. Common in continental Europe (Berlin, Paris, Vienna).
Single-Loaded Corridor: Corridor on one side, units on the other. All units face same direction. Good daylight but less efficient (NTG 0.72-0.78).
Double-Loaded Corridor: Corridor in centre, units both sides. Most area-efficient but single-aspect units on both sides. Plan depth 12-15m.

Exemplars:

Silodam (MVRDV, 2003, Amsterdam) -- mixed walk-up and maisonette, 157 units, harbour location
Ely Court (Alison Brooks Architects, 2015, London) -- brick walk-up, stair-access cores, dual-aspect
85 Falkner Street (shedkm, 2018, Liverpool) -- CLT walk-up apartments, Passivhaus

1.5 Mid-Rise Apartment (6-12 Storeys)

Metric	Value
Plan Depth	12 - 18m (double-loaded corridor)
Floor Plate	600 - 1500 m2 GIA
Core Type	1-2 lifts + 1 firefighting stair + 1 escape stair (code-dependent)
Units per Core per Floor	4 - 10
Typical Unit Mix	30-40% 1-bed, 35-45% 2-bed, 15-25% 3-bed
Density	100 - 250 DU/ha
NTG Ratio	0.75 - 0.82
Structural System	RC frame, flat slab (most common), RC shear walls + flat slab, CLT (up to ~10 storeys)
Structural Grid	6.0m x 7.5m typical (residential)
Floor-to-Floor	2.85 - 3.15m
Parking	Basement or podium; 0.3-1.0 spaces/unit
Daylight	Mix of dual-aspect (corners, ends) and single-aspect (mid-block); plan depth critical

Key Design Principles:

Corridor length should not exceed 30m from core (fire egress)
Minimum 2 units as dual-aspect per floor (corners)
North-facing single-aspect units should be avoided (poor daylight and solar gain)
Refuse chute within 30m of every unit entrance
Accessible units (Part M Category 2 min, 10% Category 3) spread across floors

Exemplars:

Via Verde (Grimshaw + Dattner, 2012, Bronx NY) -- 222 units, stepped profile, rooftop agriculture, mixed affordable
One Folgate Street (Alison Brooks Architects, 2018, London) -- 8 storeys, brick, dual-aspect, mixed tenure
The Interlace (OMA/Ole Scheeren, 2013, Singapore) -- 31 blocks of 6 storeys, stacked at angles, 1,040 units, 170,000 m2

1.6 High-Rise Residential Tower (13+ Storeys)

Metric	Value
Plan Depth	Point tower: 18-24m diameter; Slab tower: 12-16m depth
Floor Plate	400 - 900 m2 GIA (point tower); 800 - 2000 m2 (slab)
Core Size	80 - 150 m2 (lifts + stairs + lobbies + risers)
Core-to-GIA Ratio	20 - 28% (point tower); 15 - 22% (slab tower)
Lifts	2 per 80-120 units (min), +1 firefighting lift
Units per Core per Floor	4 - 8 (point tower); 8 - 16 (slab tower)
Density	200 - 600+ DU/ha
NTG Ratio	0.68 - 0.78 (point tower); 0.72 - 0.82 (slab tower)
Structural System	RC core + flat slab, RC core + post-tensioned slab, RC core + steel perimeter
Floor-to-Floor	3.0 - 3.3m (standard); 3.5 - 4.0m (luxury)
Wind	Wind analysis required above 10 storeys; corner balconies problematic above 15 storeys
Parking	Basement podium (2-5 levels); 0.2-1.0 spaces/unit

Core Design for Towers:

Scissor Stair: Two interleaving stairs in a single shaft -- compact, satisfies two-stair egress. Common in UK, used up to ~30 storeys.
Twin Stair: Two separate stairs on opposite sides of core. Required by IBC and many international codes for tall buildings.
Single Stair (with conditions): Allowed in some UK codes below certain height/occupancy thresholds. Each unit opens directly to stair lobby.
Skip-Stop: Corridor every 3rd floor, maisonette units between. Reduces corridor area, increases NTG. (Unité d'Habitation model.)

Exemplars:

Unité d'Habitation (Le Corbusier, 1952, Marseille) -- 18 storeys, skip-stop corridor, 337 units, internal street concept
Barbican Estate (Chamberlin Powell & Bon, 1969-76, London) -- three 42-storey towers, 2,014 units, brutalist
432 Park Avenue (Rafael Vinoly, 2015, New York) -- 85 storeys, 28.5m x 28.5m plan, 104 units, one of tallest residential
One Thousand Museum (Zaha Hadid Architects, 2019, Miami) -- 62 storeys, exoskeleton structure, 83 units
Bosco Verticale (Stefano Boeri, 2014, Milan) -- 2 towers (111m, 76m), 900 trees, 20,000 plants, 113 units

1.7 Maisonette

Metric	Value
Plan Depth	8 - 14m
Storeys per Unit	2 (duplex within apartment building)
Typical GIA	65 - 120 m2
Access	Corridor every other floor (skip-stop) or private external stair
Advantage	Dual-aspect living, internal stair gives house-like quality, reduced corridor area
Disadvantage	Internal stair consumes 3-4 m2 NIA per unit, accessibility challenge (entry level only)

Exemplars:

Alexandra Road Estate (Neave Brown / Camden Architects, 1978, London) -- stepped maisonettes, 520 dwellings
Brunswick Centre (Patrick Hodgkinson, 1972, London) -- stepped maisonettes facing central street

1.8 Courtyard Housing

Metric	Value
Plan Depth	6 - 10m wings around 6-15m courtyard
Storeys	1 - 3
Typical GIA	60 - 200 m2
Density	40 - 100 DU/ha
Courtyard Size	Min 4m x 4m for light; 6m x 6m for usable outdoor space
Advantage	Privacy, microclimate, daylight to deep plans, cultural tradition
Structural System	Load-bearing walls (masonry, rammed earth, concrete)

Exemplars:

Salk Institute (Louis Kahn, 1965, La Jolla CA) -- courtyard as monumental space between lab wings
Courtyard Houses Matosinhos (Souto de Moura, 1993-99, Portugal) -- minimalist courtyard villa
Bait Ur Rouf Mosque (Marina Tabassum, 2012, Dhaka) -- courtyard as environmental mediator

1.9 Co-Housing

Metric	Value
Community Size	15 - 40 households (optimal for social cohesion)
Private Unit	40 - 100 m2 NIA (smaller than conventional, offset by shared spaces)
Shared Spaces	Common house: 150-300 m2 (kitchen, dining, lounge, laundry, guest rooms, workshop)
Shared-to-Private Ratio	10 - 20% of total NIA is shared
Layout	Cluster around shared courtyard or garden; parking at periphery
Density	30 - 80 DU/ha

Exemplars:

Trudeslund (1981, Birkerod, Denmark) -- one of the earliest, 33 households, one-storey
Marmalade Lane (Mole Architects, 2019, Cambridge) -- 42 homes, common house, car-free street
Lilac (2013, Leeds) -- mutual home ownership, straw bale construction, 20 households

1.10 Micro / Co-Living

Metric	Value
Private Unit	10 - 25 m2 NIA (bedroom + en-suite or pod bathroom)
Shared Spaces	Kitchen, living, laundry, co-working, gym: 5-10 m2/unit
Building Type	Typically mid-rise apartment, repurposed hotel, or purpose-built
Density	200 - 500+ DU/ha
NTG Ratio	0.65 - 0.75 (extensive shared space)
Target User	Young professionals, students, digital nomads, short-term workers

Exemplars:

The Collective Old Oak (PLP Architecture, 2016, London) -- 546 units, largest co-living building in the world at completion
Carmel Place (nARCHITECTS, 2016, New York) -- 55 micro-units, 23-33 m2, modular prefab construction
StarCity (various locations, 2020+) -- co-living operator, units from 14 m2 with extensive shared amenity

2. Office Typologies

2.1 Speculative Shell & Core

Metric	Value
Floor Plate Area	1,000 - 2,500 m2 NIA typical; prime City of London: 1,500-2,000 m2
Plan Depth (core to glass)	12 - 15m (BCO recommendation: max 15m for naturally ventilated zones)
Floor-to-Floor	3.6 - 4.2m (BCO standard: 3.9m typical)
Ceiling Height	2.6 - 2.85m finished ceiling (BCO: min 2.6m, preferred 2.7-2.8m)
Raised Floor Depth	100 - 150mm (BCO: min 150mm for full flexibility)
Ceiling Void	400 - 600mm (services distribution, acoustic ceiling)
Structural Depth	300 - 500mm (PT slab: 300mm; composite: 400-500mm)
Structural Grid	7.5m, 9.0m, 10.8m, or 12.0m (must coordinate with parking below: 7.2m or 7.5m)
NTG Ratio	0.80 - 0.85 (BCO target: 82.5%)
Core-to-GIA	15 - 22%
Loading	2.5 kN/m2 + 1.0 kN/m2 partitions (minimum)

Exemplars:

Willis Building (Foster + Partners, 2007, London) -- crescent plan, 46,450 m2, column-free 18m spans
The Leadenhall Building (Rogers Stirk Harbour, 2014, London) -- 51 storeys, external bracing, tapered form, 84,424 m2
22 Bishopsgate (PLP Architecture, 2020, London) -- 62 storeys, 128,000 m2, largest office floor plates in City of London

2.2 Owner-Occupied / Corporate HQ

Metric	Value
Floor Plate	2,000 - 10,000+ m2 (single-user, often deeper plans)
Plan Depth	15 - 25m (internal atria for daylight to deep plans)
Floor-to-Floor	3.9 - 4.5m (more generous for owner-specified services)
NTG Ratio	0.72 - 0.80 (more generous common areas, atria, amenity)
Typical Features	Atrium, branded reception, staff restaurant, fitness centre, town hall spaces

Exemplars:

Inland Steel Building (SOM/Bruce Graham, 1958, Chicago) -- first modern curtain wall office tower, all services in separate tower, 18.3m clear spans, 19 storeys
Apple Park (Foster + Partners, 2017, Cupertino) -- 260,000 m2 ring plan, 1.6km circumference, 12,000 employees
Bloomberg European HQ (Foster + Partners, 2017, London) -- 102,000 m2, BREEAM Outstanding (98.5%), spiralling ramp circulation

2.3 Co-Working / Flex Space

Metric	Value
Floor Plate	1,000 - 5,000 m2 per location
Desk Density	6 - 8 m2/person (denser than conventional)
Sharing Ratio	0.6 - 0.8 desks per member
Meeting Room Ratio	1 room per 15-20 members
Amenity	20 - 30% of NIA (kitchen, lounge, event space, phone booths)
NTG Ratio	0.72 - 0.78 (extensive amenity and circulation)
Floor-to-Floor	Prefers high ceilings (exposed services aesthetic) > 3.5m

Exemplars:

WeWork (various locations) -- standardised fit-out, 60-80% open desk, glass-fronted offices
Second Home (Selgascano, 2014, London) -- elliptical glass offices within open-plan, 2,500 m2
Factory Berlin (Julian Breinersdorfer, 2014) -- adaptive reuse, 14,000 m2, start-up campus

2.4 Office Campus

Metric	Value
Site Area	5 - 50+ ha
Building Coverage	20 - 40% (generous landscape)
Floor Plate	2,000 - 5,000 m2 per building
Storeys	2 - 6 typical (low-rise campus character)
Density	0.3 - 0.8 FAR
Parking	Surface or structured; 1 space per 30-50 m2 NIA
Amenity	Central hub (dining, fitness, retail), outdoor sport/recreation

Exemplars:

Googleplex (various architects, Mountain View) -- campus of low-rise buildings, 100,000+ employees across Silicon Valley
Novo Nordisk HQ (Henning Larsen, 2014, Copenhagen) -- 3 concentric rings, 73,000 m2, LEED Platinum
Samsung Semiconductor (NBBJ, 2015, San Jose) -- 102,000 m2, 10-storey intersecting volumes

3. Healthcare Typologies

3.1 Hospital Plan Types

Podium + Tower:

Metric	Value
Podium	2-4 storeys, large floor plates (5,000-15,000 m2) for clinical departments
Tower	6-15 storeys above podium for inpatient wards (1,000-2,000 m2 floor plates)
Advantage	Clinical departments get large column-free floor plates; wards get daylight and views
Disadvantage	Long vertical travel distances; complex structural transfer at podium-tower interface
Exemplar	Royal London Hospital (HOK/Skanska, 2012) -- 17 storeys, 115,000 m2, largest new-build hospital in UK

Courtyard / Chequerboard:

Metric	Value
Floor Plate	3,000 - 8,000 m2 with internal courtyards for daylight
Storeys	3 - 6
Advantage	All departments at low level, short horizontal travel, natural light to deep plans
Disadvantage	Large footprint requires large site; limited vertical expansion
Exemplar	Khoo Teck Puat Hospital (CPG Consultants, 2010, Singapore) -- courtyard plan, biophilic design, 590 beds

Finger Plan (Pavilion):

Metric	Value
Plan	Linear wings (fingers) connected by a central spine corridor
Wing Depth	12 - 18m per wing
Spacing	18 - 25m between wings (daylight and ventilation)
Advantage	Excellent daylight and ventilation, phased expansion by adding fingers
Disadvantage	Long horizontal travel distances, large site
Exemplar	Nightingale model hospitals (19th century); modern: Alder Hey Children's Hospital (BDP, 2015, Liverpool)

Nucleus / Compact:

Metric	Value
Plan	Compact cruciform or radial plan around central core
Floor Plate	2,000 - 4,000 m2
Advantage	Short travel distances, efficient servicing
Disadvantage	Limited daylight to central zones, complex wayfinding
Exemplar	NHS Nucleus template hospitals (1970s-80s UK)

3.2 Key Healthcare Metrics

Metric	Standard
Corridor Width (bed movement)	2.4m min clear; 2.7m recommended
Corridor Width (staff/patient ambulatory)	1.8m min; 2.1m recommended
Patient Room Door Width	1.2m min clear (bed passage)
Nurse Station Visibility	Direct sightline to all beds in unit (max 28-32 bed unit)
Clean-to-Dirty Flow	Unidirectional; sterile > clean > dirty, no backtracking
Departmental Stacking	ED and Imaging at ground; Surgery above ED; Wards above Surgery
Floor-to-Floor	4.2 - 5.0m (hospital typical, interstitial space for services in some designs)
NTG Ratio	0.55 - 0.65 (most inefficient building type due to wide corridors, complex services)

3.3 Clinic / Surgery Centre

Metric	Value
Floor Plate	500 - 3,000 m2
Storeys	1 - 3
Core Spaces	Waiting, reception, consulting rooms, treatment rooms, staff areas
Consult Room	14 - 16 m2 (GP: 12 m2 min)
Waiting Area	1.5 - 2.0 m2 per concurrent patient
NTG Ratio	0.70 - 0.78
Parking	3 - 5 spaces per consulting room

Exemplar: Maggie's Centres (various architects: Gehry, Hadid, Heatherwick, Chipperfield) -- 200-400 m2, domestic scale, open-plan kitchen as heart, no waiting room, garden

4. Education Typologies

4.1 Primary School

Metric	Value
Site Area	1.0 - 2.0 ha (1 FE = 210 pupils)
GIA	1,100 - 2,200 m2 (1FE - 3FE) per BB103
Storeys	1 - 2 (single-storey preferred for youngest children)
Classroom	55 - 63 m2, min 2.0 m2/pupil
Corridor Width	1.8m min; 2.4m recommended (doubled as social/display space)
Assembly/Dining Hall	120 - 170 m2 (dual-use for PE in smaller schools)
NTG Ratio	0.72 - 0.78
Daylight	Every teaching space must have windows; min average daylight factor 2%

Plan Types:

Finger plan: Classrooms in parallel wings with outdoor spaces between. Good daylight, natural ventilation. Requires large site.
Cluster: Groups of classrooms around a shared learning space. Supports collaborative teaching. Common in modern UK schools.
Street: Central corridor (wide, daylit) with classrooms on both sides. Compact, efficient.
Courtyard: Classrooms wrap around secure outdoor space. Good for urban sites. Passive surveillance.

Exemplars:

Burntwood School (Allford Hall Monaghan Morris, 2015, London) -- RIBA Stirling Prize, prefabricated CLT classrooms
Fuji Kindergarten (Tezuka Architects, 2007, Tokyo) -- oval roof as playground, open-air classrooms, 600 children
Westborough Primary School (Cottrell & Vermeulen, 2001, Southend) -- straw bale construction, environmental showcase

4.2 Secondary School

Metric	Value
Site Area	3.0 - 7.0 ha (6FE - 12FE = 900-1800 pupils)
GIA	6,000 - 12,000 m2 per BB103
Storeys	2 - 4
Classroom	55 - 65 m2 (30 pupils)
Specialist Rooms	80 - 110 m2 (science labs, workshops, studios)
Sports Hall	594 m2 (4-court); 891 m2 (6-court)
Corridor Width	2.4 - 3.0m (high traffic, lockers, display)
NTG Ratio	0.68 - 0.75
Floor-to-Floor	3.3 - 3.9m (higher for sports hall and specialist spaces)

Exemplars:

School of Engineering and Science, Aalborg University (C.F. Moller, 2010) -- open labs, flexible teaching
Orestad Gymnasium (3XN, 2007, Copenhagen) -- open-plan school, flexible learning, 4 storeys around central stair
Whitby Academy (GSSArchitecture, 2013) -- compact 3-storey, central atrium, 900 pupils

4.3 University

Metric	Value
Campus Coverage	20 - 40% of site
Building Types	Teaching, laboratory, library, student union, residential, sports, administration
Lecture Theatre	1.2 - 1.5 m2/seat (tiered); 200-400 seats typical
Teaching Lab	2.5 - 3.5 m2/student (wet science); fume hoods, services
Library	4 - 5 m2/reader; stack area 5-7 m2 per 1000 volumes
Floor-to-Floor	3.6 - 4.5m (lab buildings); 3.3 - 3.9m (teaching/admin)
NTG Ratio	0.60 - 0.72 (lab-heavy buildings lower)

Exemplars:

Rolex Learning Centre (SANAA, 2010, Lausanne) -- single undulating floor plate, 20,000 m2, no internal walls
Li Ka Shing Knowledge Institute (Diamond Schmitt, 2011, Toronto) -- medical school, simulation labs, 16 storeys
Saw Swee Hock Student Centre (O'Donnell + Tuomey, 2014, LSE, London) -- RIBA award, angular form, 6,300 m2

5. Cultural Typologies

5.1 Museum

Plan Types:

Linear Sequence (Enfilade): Rooms connected in sequence; visitor follows a prescribed route. Total control of narrative. Examples: Vatican Museums, Uffizi.

Free-Flow (Open Plan): Large open galleries with moveable partitions; visitor chooses own path. Flexible for changing exhibitions. Example: Centre Pompidou (Piano + Rogers, 1977, Paris), Tate Modern Turbine Hall.

Mixed (Sequential + Free-Flow): Permanent collection in sequence, temporary exhibitions in free-flow spaces. Most common contemporary approach.

Metric	Value
Gallery Ceiling Height	4.5 - 6.0m (paintings); 6.0 - 10.0m (large sculpture/installation)
Gallery Width	6 - 12m (paintings on walls); 15 - 30m (sculpture, installation)
Gallery Proportions	1:1.5 to 1:2 (width:length) for paintings galleries
Hanging Height	Eye line at 1.5m; centre of work at 1.45-1.55m
Lighting (paintings)	200 lux max; UV filtered; no direct sunlight
Lighting (works on paper)	50 lux max; no natural light
Climate Control	20 +/- 2 deg C, 50 +/- 5% RH, 24/7/365
BOH Ratio	40 - 60% of public area (conservation, storage, loading, offices)
NTG Ratio	0.55 - 0.65
Floor Loading	5.0 kN/m2 min for sculpture galleries

Exemplars:

Guggenheim Bilbao (Frank Gehry, 1997) -- 24,000 m2, titanium-clad, free-flow + sequential galleries, the "Bilbao Effect"
MAXXI (Zaha Hadid, 2010, Rome) -- flowing concrete galleries, 21,000 m2, no right angles
Louvre Abu Dhabi (Jean Nouvel, 2017) -- 9,200 m2 galleries under 180m diameter dome, "rain of light"
Tate Modern (Herzog & de Meuron, 2000 + 2016, London) -- Bankside Power Station conversion, 35,000 m2

5.2 Theatre and Auditorium

Configurations:

Type	Description	Capacity Range	Actor-Audience Distance
Proscenium	Stage behind frame, audience in front	300 - 2,500	15 - 30m
Thrust	Stage projects into audience on 3 sides	200 - 1,200	8 - 18m
Arena (Theatre-in-the-Round)	Audience surrounds stage	100 - 600	5 - 12m
Black Box	Flexible, reconfigurable space	50 - 400	Variable
Courtyard	Galleried, audience on multiple levels wrapping stage	200 - 1,000	8 - 20m

Metric	Standard
Seat Width	500 - 530mm (min), 550mm (premium)
Row Spacing	760 - 850mm back-to-back (min 760mm for sightlines)
Aisle Width	1.1m min (IBC), wider for higher capacity
Sightline (C-value)	65 - 125mm (cinema); 100 - 130mm (theatre); every seat sees over head in front
Acoustic Volume	6 - 10 m3/seat (symphony); 4 - 7 m3/seat (drama); 3 - 5 m3/seat (cinema)
Reverberation Time (RT60)	1.7 - 2.2s (symphony); 1.0 - 1.4s (drama); 0.6 - 0.8s (speech/cinema)
Stage Depth	10 - 14m (proscenium)
Fly Tower Height	2.5x proscenium opening height (typically 22-30m above stage)
BOH-to-FOH Ratio	0.7 - 1.0 (smaller venues); 1.0 - 1.5 (major opera houses)
NTG Ratio	0.45 - 0.55 (performing arts are the least efficient building type)

Exemplars:

Sydney Opera House (Jorn Utzon, 1973) -- multiple venues, 5,738 seats total, expressionist shells
Elbphilharmonie (Herzog & de Meuron, 2017, Hamburg) -- 2,100-seat vineyard hall on converted warehouse, 110m tall
National Theatre (Denys Lasdun, 1976, London) -- three auditoria (Olivier, Lyttelton, Dorfman), brutalist terraces
Harbin Opera House (MAD Architects, 2015) -- 1,600 seats, organic form, Manchurian landscape

5.3 Library

Metric	Value
Stack Area	5 - 7 m2 per 1,000 volumes (open); mobile shelving halves this
Reading Space	4 - 5 m2 per reader
Digital/Computer	3 - 4 m2 per workstation
Children's Area	30 - 80 m2 (dedicated, ground floor preferred)
Floor Loading	6.5 kN/m2 min for stacks; 2.5 kN/m2 for reading areas
Ceiling Height	3.0 - 4.0m (reading rooms); 2.7m min (stacks)
NTG Ratio	0.65 - 0.75
Daylight	Reading areas: natural light preferred, avoid direct sun on collections

Exemplars:

Seattle Central Library (OMA/Rem Koolhaas, 2004) -- 34,000 m2, "Book Spiral" continuous stack ramp, faceted glass skin
Library of Birmingham (Mecanoo, 2013) -- 31,000 m2, interlocking gold circles facade, 10 storeys
Tianjin Binhai Library (MVRDV, 2017) -- the "Eye," 33,700 m2, undulating bookshelves, central sphere auditorium

6. Hospitality Typologies

6.1 Hotel Plan Types

Corridor-Loaded (Double-Loaded):

Metric	Value
Corridor Width	1.5 - 1.8m (budget); 1.8 - 2.1m (luxury)
Room Depth	6.0 - 8.0m (budget/midscale); 8.0 - 12.0m (luxury)
Room Width	3.3 - 3.6m (budget); 3.6 - 4.5m (midscale); 4.5 - 6.0m (luxury)
Rooms per Floor	20 - 40 per corridor wing
NTG Ratio	0.62 - 0.72
Advantage	Most efficient layout; maximizes rooms per floor
Disadvantage	Single-aspect rooms; long, institutional corridors

Atrium:

Metric	Value
Atrium Width	15 - 30m
Atrium Height	Full building height (dramatic)
Rooms per Floor	30 - 80 per floor (wrapped around atrium)
NTG Ratio	0.55 - 0.65 (atrium consumes GIA)
Advantage	Dramatic arrival, daylight to corridors, wayfinding
Disadvantage	Acoustic issues, fire engineering complexity, less efficient
Exemplar	Hyatt Regency Atlanta (John Portman, 1967) -- first atrium hotel, 22 storeys, 800 rooms

Courtyard:

Metric	Value
Courtyard Size	15 - 40m across
Storeys	2 - 5
NTG Ratio	0.58 - 0.68
Advantage	Outdoor amenity, daylight, resort character
Exemplar	Aman Venice (Papadopoli Palace renovation) -- historic courtyard hotel

Tower:

Metric	Value
Floor Plate	800 - 2,000 m2 GIA
Rooms per Floor	12 - 30
Core	2+ lifts, service lift, firefighting lift, 2 stairs
NTG Ratio	0.60 - 0.68
Exemplar	Marina Bay Sands (Moshe Safdie, 2010, Singapore) -- 3 towers, 2,561 rooms, SkyPark

6.2 Hotel Key Metrics

Metric	Budget	Midscale	Upscale	Luxury
Room NIA (m2)	16-20	22-28	30-40	40-60+
Bathroom NIA (m2)	3-4	4-5	6-8	8-12+
Floor-to-Floor (m)	2.9-3.1	3.0-3.3	3.3-3.6	3.6-4.2
Lobby (m2/room)	0.5-0.8	0.8-1.2	1.2-1.8	1.8-3.0
F&B (seats/room)	0.3-0.5	0.5-0.7	0.7-1.0	1.0-1.5
BOH (% of FOH)	40-50%	45-55%	50-60%	55-70%
GIA/room (m2)	35-45	50-65	70-90	90-140
Staff/room ratio	0.3-0.5	0.5-0.8	0.8-1.2	1.2-2.5

6.3 Restaurant

Metric	Value
Dining Area per Seat	1.4 - 1.8 m2 (casual); 1.8 - 2.5 m2 (fine dining)
Kitchen Area	40 - 60% of dining area (full production); 25 - 40% (finishing kitchen)
Bar Area	0.5 - 0.8 m2/stool + standing area
WC Provision	1 per 30 covers (M), 1 per 15 covers (F) minimum
Floor-to-Ceiling	3.0 - 3.5m (standard); 4.0 - 5.0m (destination restaurant)
Kitchen Ceiling	3.0m min (extraction hoods, grease ducts)
Service Entrance	Separate from customer entrance

7. Hybrid and Mixed-Use Typologies

7.1 Podium-Tower

Metric	Value
Podium	2-6 storeys, large floor plate (2,000-10,000 m2), retail/office/parking
Tower	10-80+ storeys, smaller floor plate (400-2,000 m2), residential/hotel/office
Structural Transfer	At podium-tower interface; transfer beams/slabs up to 3m deep
Setback	Tower set back from podium edge (3-5m typical) for amenity terrace
Advantage	Urban street wall at podium height; density via tower; mixed uses
Disadvantage	Structural cost of transfer; servicing complexity; fire separation between uses

Exemplars:

De Rotterdam (OMA, 2013, Rotterdam) -- three interconnected towers on shared podium, 162,000 m2, office/residential/hotel
Brickell City Centre (Arquitectonica, 2016, Miami) -- mixed-use, climate ribbon, retail podium + residential towers
Battersea Power Station Phase 2 (Foster + Partners / Gehry Partners, 2021, London) -- retained power station as podium, new residential towers

7.2 Stacked Uses (Vertical Mixed-Use)

Metric	Value
Typical Stacking Order (bottom to top)	Parking > Retail > Office > Hotel > Residential
Logic	Heavier uses lower, public uses at grade, quieter uses higher
Fire Separation	2-hour fire-rated floor between different use classes (IBC/EN)
Acoustic Separation	Min 50 dB airborne + 55 dB impact between residential and commercial
Separate Cores	Each use class requires its own lift lobby and fire escape
Shared Services	Central plant with metered distribution to each use
Floor-to-Floor Variation	Retail 4.5m, Office 3.9m, Hotel 3.3m, Residential 3.0m

7.3 Side-by-Side

Metric	Value
Configuration	Different uses in adjacent volumes sharing a common base/ground level
Advantage	Independent structural systems, simpler fire engineering
Disadvantage	Requires wide site; less density than vertical stacking
Separation	Fire wall between uses; shared podium level for retail/public

7.4 Vertical Village

Metric	Value
Concept	Self-contained community in a single tall building, with all uses vertically integrated
Sky Lobbies	Every 10-15 floors, with shared amenity (gardens, retail, social spaces)
Structural	Outrigger trusses at sky lobbies for wind resistance
Exemplar	The Interlace (OMA, 2013, Singapore) -- horizontal village concept; WOHA Architects' projects in Singapore (e.g., Oasia Hotel Downtown, 2016 -- 314 rooms, sky gardens every 6 floors, 89% green plot ratio)

7.5 Key Mixed-Use Design Challenges

Challenge	Resolution
Entrance Separation	Each use gets its own lobby and address; residential entrance must be distinct from commercial
Servicing Conflicts	Separate loading docks or time-managed shared dock; separate waste collection
Structural Grid Mismatch	Office (9m grid) vs. residential (6-7.5m grid) vs. parking (7.2m grid) -- transfer structure
Ceiling Height Variation	Different floor-to-floor heights require careful section design at interfaces
Acoustic Isolation	Floating floors, isolated structural connections, buffer floors at use transitions
Fire Egress	Each use class must have independent egress to grade; no shared escape routes
Wind Effects	Tower-on-podium creates downdrafts; wind studies required for pedestrian comfort
Parking Allocation	Separate parking zones for each use; different peak times enable shared reduction

References

Neufert, E. & Neufert, P. (2019). Neufert Architects' Data. 5th ed. Wiley-Blackwell.
MHCLG (2015). Technical Housing Standards -- Nationally Described Space Standard. UK Government.
BCO (2019). BCO Guide to Specification. British Council for Offices.
NHS Estates. Health Building Notes (HBN) Series. UK Department of Health.
DfE (2014). Building Bulletin 103 / 104. UK Department for Education.
Sport England. Design Guidance Notes. Sport England.
Littlefield, D. (2008). Metric Handbook: Planning and Design Data. Routledge.
Koolhaas, R. & Mau, B. (1995). S, M, L, XL. Monacelli Press.
Mozas, J. & Fernandez Per, A. (2006). Density: New Collective Housing. a+t architecture publishers.
Firley, E. & Stahl, C. (2009). The Urban Housing Handbook. Wiley.
Kliment, S.A. (ed.). Building Type Basics series. Wiley.
Council on Tall Buildings and Urban Habitat (CTBUH). Tall Building Design Guides.
IBC (2021). International Building Code. ICC.
RIBA Plan of Work (2020). Royal Institute of British Architects.

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